May I ask a couple of questions about this new lens? Bryan mentioned his disappointment (along with several others on this forum) about the price tag for a non-IS version. He believes the price premium will be worth it, though.
What exactly is to be expected from this lens? Better sharpness at 2.8, I suppose. At narrower stops, does the previous version perform poorly? Not really.
I would think that if it's print that's coming out of this lens, is anyone really going to notice the difference? Versus the previous one, to be compared to?
I would also guess not.
At the wide end, most people will likely use this for landscape photography. They stop the lens down for this, mostly.
Add to this what a good photo editing program could do to the images, the price difference on this lens seems way out of line. Especially with no IS. Of course, if one didn't own a 24-70, they might bite on the new version.
Overall, this announcement had me rolling my eyes into the back of my head, and I barely got them back into focus.